161507165 has 8 divisors (see below), whose sum is σ = 197465688. Its totient is φ = 126767680.

The previous prime is 161507141. The next prime is 161507197. The reversal of 161507165 is 561705161.

161507165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 68326756 + 93180409 = 8266^2 + 9653^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161507165 - 2¹⁰ = 161506141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304466 + ... + 304995.

It is an arithmetic number, because the mean of its divisors is an integer number (24683211).

Almost surely, 2^161507165 is an apocalyptic number.

It is an amenable number.

161507165 is a deficient number, since it is larger than the sum of its proper divisors (35958523).

161507165 is an equidigital number, since it uses as much as digits as its factorization.

161507165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609519.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 161507165 is about 12708.5469271668. The cubic root of 161507165 is about 544.5828134665.

The spelling of 161507165 in words is "one hundred sixty-one million, five hundred seven thousand, one hundred sixty-five".